| 摘要 |
<p>A retractable syringe needle featuring an adjustable length tube (40) having a first end, and a second end. The adjustable length tube (40) has a length which may be reversibly altered from a first contracted length to a second extended length. A syringe barrel (41) may be secured to the first end of the adjustable length tube (40), and a cylindrical hub having a hollow hypodermic needle attached thereto may be secured to the second end of the adjustable length tube (40). A tubular sheath (43) is disposed around the adjustable length tube (40). The tubular sheath (43) has a first end which is rigidly connected with the first end of the adjustable length tube (40), and a second end having an opening which is sufficiently large to allow the end of the hypodermic needle to pass therethrough. The length of the adjustable length tube (40) may be altered from the contracted length to the extended length.</p> |
